Malicious PDF — malware analysis report

Static analysis result for SHA-256 b599a3325e34f737…

MALICIOUS

PDF

75.6 KB Created: 2021-03-18 00:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2f724421d3391b28d89da9c3bba6ba24 SHA-1: ce216f8ed4c613de5d7c44c5faa422f83ea473a0 SHA-256: b599a3325e34f73752261fbb0a796c4f8d41353e6a9d71946e80a818e9e9bf33
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/123?utm_term=cosmic+rays+pdf PDF link annotation
    • https://cdn.sqhk.co/guvawatuzax/jheqhhN/shifty_jelly_weather_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/hgdAPia/bifabofe.pdfIn PDF document text
    • https://cdn.sqhk.co/puviponapib/nMayXQC/bidikatepajewizuzasi.pdfIn PDF document text
    • http://debegezuvume.iblogger.org/binigurewitotikariwoweka.pdfIn PDF document text
    • http://nobelopagix.22web.org/93881952900.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuxopova/hdhgxgg/pixitracker_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/hfzHcmb/essential_university_physics_volume_1_3rd_edition_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c7020cf-f431-4c84-b1fe-27cea8616b7b/fumukas.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_ad708f1a82c34a57af1e4e1b970adb0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/firefox_69._0._1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bce3ec-1479-4bdf-b7c2-a8b09bd7c4e1/kavenanazip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0bccf5-1551-468d-acc0-f040a2be206e/can_u_die_from_overeating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36335be5-4c5f-42db-ab24-de2b7a44b806/do_the_outlander_books_get_better.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/zamowofaledudetitavorixof.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/6th_and_7th_book_of_moses_psalms.pdfIn PDF document text
    • http://tuvatopuvonu.epizy.com/world_political_map_blank_a4_size.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_9631d1196adb4e1ba350df5432e1115f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/du._ac._in_datesheet_2019_nov_dec.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9f97dc-396b-41d4-ad53-56e558ed592c/liwenokilowef.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 5276 bytes
SHA-256: 2b8e70e1287d9cfa931e2316da76a701bf9045c5a03567c855c0233abb4508b2
font_01_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 11660 bytes
SHA-256: 5a6093fd885b2783cdea99626f5804cb90f296a4ef13dd2eeb4b3b5ee8c7c330